The QLF meter’s high accuracy and repeatability is achieved through the unique measurement section within the meter body where flow is conditioned and Delta T measured along its axis. The meter’s principle of operation measures the time difference of an ultrasonic wave traveling with and against the flowing medium. The time difference is directly proportional to the fluid’s flow rate. Temperature is measured via an RTD embedded into the flow meter body.
The QLF in-line ultrasonic flow meter is a compact, rugged, versatile, cost-effective solution for measuring ultra-low flow in a number of industries, such as aerospace, agricultural, automotive, chemical, oil & gas, industrial, and pharmaceutical. The meter’s construction makes it the meter of choice for many high purity and corrosive fluids. Typical measurement application examples include: Small engine fuel consumption; chemical injection systems; water treatment chemical skids and sample stations for cooling towers, boilers and membrane filtration systems; aircraft fuel flow stands; diesel exhaust fluid (DEF) consumption; liquid chromatography; and side stream filtration.
The compact QLF ultrasonic meter has no moving parts, non-wetted sensors and no obstructions in the flow stream to cause in increase in pressure drop. Available for 1/8-inch piping, the meter’s flow range is 0.001 to 3.5 GPM. It is accurate to +/-0.5% of reading plus zero stability, and repeatability is +/-0.2% over 10:1 turndown. The meter handles a temperature range of 14°F to 176°F (-10°C to 80°C) and has analog, scaled frequency and Modbus RTU outputs.
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